Question Number 51539 by ajfour last updated on 28/Dec/18 Commented by ajfour last updated on 28/Dec/18 $${Rope}\:{has}\:{a}\:{total}\:{length}\:{L}\:{and}\:{linear} \\ $$$${mass}\:{density}\:\rho.\:{System}\:{is}\:{released} \\ $$$${as}\:{shown}.\:{The}\:{pulley}\:{is}\:{a}\:{disc}.\:{Find} \\ $$$${time}\:{it}\:{takes}\:{for}\:{the}\:{rope}\:{to}\:{unwind} \\ $$$${completely}.…
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Question Number 182405 by abdullah_ff last updated on 09/Dec/22 $${Zombie}\:{apocalypse}\:{has}\:{started}.\:{You} \\ $$$${are}\:{at}\:{point}\:{A}\:\left(\mathrm{3},\mathrm{2}\right).\:{At}\:{point}\:{B}\:\left(−\mathrm{5},\mathrm{4}\right) \\ $$$${there}\:{is}\:{a}\:{shelter}.\:{A}\:{river}\:{flows}\:{along}\: \\ $$$${the}\:{X}\:{axis}.\:{You}\:{are}\:{running}\:{at}\:{a}\:{constant} \\ $$$${velocity}\:\mathrm{1}\:{ms}^{−\mathrm{1}} \:{with}\:{an}\:{intention}\:{to} \\ $$$${reach}\:{the}\:{shelter}\:{but}\:{before}\:{that},\:{you} \\ $$$${have}\:{to}\:{reach}\:{the}\:{river}\:{and}\:{fill}-{up}\:{your} \\ $$$${water}\:{jar}.\:{What}\:{is}\:{the}\:{lowest}\:{time}\:{it}\:…
Question Number 51325 by peter frank last updated on 26/Dec/18 $${If}\:{a}\:{number}\:{of}\:{little}\: \\ $$$${droplets}\:{all}\:{of}\:{the}\:{same}\: \\ $$$${radius}\:{r}\:{coalesce}\:{to} \\ $$$${form}\:\:{a}\:{single} \\ $$$${drop}\:{of}\:{radius}\:{R}.{show} \\ $$$${that}\:{the}\:{rise}\:{in}\:{temperature} \\ $$$${is}\:{given}\:{by} \\ $$$$\frac{\mathrm{3}{T}}{{pJ}}\left(\frac{\mathrm{1}}{{r}}−\frac{\mathrm{1}}{{R}}\right)…
Question Number 182280 by BHOOPENDRA last updated on 06/Dec/22 Commented by BHOOPENDRA last updated on 06/Dec/22 Commented by BHOOPENDRA last updated on 07/Dec/22 $${can}\:{you}\:{please}\:{try}\:{Mr}.{W} \\…
Question Number 51107 by peter frank last updated on 24/Dec/18 $${A}\:{ball}\:{is}\:{bouncing}\:{down} \\ $$$${a}\:{flight}\:{of}\:{stairs}.{The}\: \\ $$$${coefficiate}\:{of}\:{restitution} \\ $$$${is}\:{e}.{The}\:{height}\:{of}\:{each}\:{step} \\ $$$${d}\:{and}\:{the}\:{ball}\:{descends} \\ $$$${one}\:{step}\:{at}\:{each}\:{bounce}. \\ $$$${After}\:{each}\:{bounce}\:{it}\:{rebounds} \\ $$$${to}\:{heigt}\:\:{h}\:{above}\:{the}\:{next}…
Question Number 50993 by peter frank last updated on 23/Dec/18 $${Prove}\:{newtons}\:{law}\:{of} \\ $$$${cooling}\:{by}\:{stefan}\:{law} \\ $$ Answered by tanmay.chaudhury50@gmail.com last updated on 23/Dec/18 Commented by tanmay.chaudhury50@gmail.com…
Question Number 50973 by Necxx last updated on 22/Dec/18 Answered by mr W last updated on 22/Dec/18 $${see}\:{Q}\mathrm{50913}. \\ $$$${t}_{\mathrm{1}} =\mathrm{2}{e}\sqrt{\frac{\mathrm{2}{h}}{{g}}}=\mathrm{2}\left(\frac{\mathrm{3}}{\mathrm{4}}\right)\sqrt{\frac{\mathrm{2}×\mathrm{20}}{\mathrm{10}}}=\mathrm{3}\:{seconds} \\ $$ Commented by…
Question Number 50967 by ajfour last updated on 22/Dec/18 Commented by ajfour last updated on 22/Dec/18 $${String}\:{is}\:{wrapped}\:{over}\:{cylinder}, \\ $$$${find}\:\boldsymbol{{l}}\:{for}\:{equilibrium}. \\ $$ Answered by ajfour last…
Question Number 50915 by peter frank last updated on 22/Dec/18 $${The}\:{range}\:{of}\:{riffle}\:{bullet} \\ $$$${is}\:\mathrm{1000}{m}\:{when}\:\theta\:{is}\:{the}\:{angle} \\ $$$${of}\:{projection}.{if}\:{the}\:{bullet} \\ $$$${is}\:{fired}\:\:{with}\:{the}\:{same}\: \\ $$$${angle}\:\:{from}\:{a}\:{car}\:{travelling} \\ $$$${at}\:\mathrm{36}{km}/{h}\:{towards}\:{the}\:{target} \\ $$$${show}\:{that}\:{the}\:{range}\:{will} \\ $$$${be}\:{increased}\:{by}…